What does it mean to say that a copyright registration was issued under the "rule of doubt"?

Name: What does it mean to say that a copyright registration was issued under the "rule of doubt"?
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The Answer is In a questionable case of copyrightability, the Copyright Office will resolve the case in favor of the applicant. Even though the Office has doubts about copyrightability, it will resolve doubts in favor of the applicant and allow a court to make a final determination if questions later arise.

What Does It Mean to Say That a Copyright Registration